Extraction selectivity of organic solutions of a cyclic polyether with respect to the alkali cations
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Evaluation of overall extraction constants for the crown ether-complex ions of alkali and alkaline-earth metal with counter picrate ions from water into nitrobenzene based on their component equilibrium constants
2012, Journal of Molecular LiquidsCitation Excerpt :If the reported Kex ± value (≈ 2.97 [3]) corresponds to that for the co-extraction of CsL2+ and CsL+, then its actual extraction constant (Kex ±L) can be expressed as Kex ± + Kex±,2[L]NB. Hence, when [DB18C6]NB was experimentally equal to 0.05 mol dm− 3 [3], the log Kex ±L value was estimated to be 1.39. At least, this value is larger than the log Kex ± value (= 0.9) evaluated here for the Na(DB18C6)+ extraction (see Table 2).
18-Crown-6 for the selective extraction and separation of cerium(IV) from nitrate medium containing some lanthanides
2011, International Journal of Mineral ProcessingCitation Excerpt :The macrocyclic crown ethers achieved considerable importance for separation and determination of a large number of metal ions (Kim et al., 1997; Tang and Wai, 1989a,b). Crown ethers showed selective extraction for metal ions, especially alkali and alkaline earth metals, in terms of the correspondence between the extracted metal ion crystal radii and the cavity size of the crown ethers used (Khalifa et al., 1988; Danesi et al., 1975; Mayers, 1980). Due to their ion size selective nature and ability to transfer metal ions into organic media, crown ethers have been frequently used as extractants and phase transfer reagents in solvent extraction and liquid membrane processes (Takeda, 1984; Koshima and Onishi, 1993; Zouhri et al., 1995; Mohaparta and Manchanda, 1996; Zolotov, 1997).
Development of highly selective compounds for solvent extraction processes: Partitioning and transmutation of long-lived radionuclides from spent nuclear fuels
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2007, Journal of Molecular StructureSelective transport of cesium using a supported liquid membrane containing di-t-butyl benzo 18 crown 6 as the carrier
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